BBC: Plans to expand shale gas "fracking" in the UK must learn from leaks and poor monitoring at existing onshore oil and gas sites, scientists say.
A review of 2,152 wells drilled from 1902-2013 found up to 100 "orphaned" wells for which no firm is responsible.
Only two cases of well "failure" were recorded, but legacy sites are not monitored for leaks, the authors note.
The study led by ReFINE (Researching Fracking in Europe) is published in the journal Marine and Petroleum Geology.
It is...